/Engine/Source/Runtime/MessagingRpc/Public/MessageRpcServer.h
Add an RPC request handler.
virtual void AddHandler ( const [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) & RequestMessageType, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IMessageRpcHandler](API\Runtime\MessagingRpc\IMessageRpcHandler) > & Handler )